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Each throw of dice follows the Bernoulli distribution , hence the probability of heads is θ and the probability of tails is 
$$ \left(1-\theta \right) $$
, and in general its probability mass function is given by

$$ P\left(x=j/\theta \right)={\theta}^j{\left(1-\theta \right)}^{\left(1-j\right)}\forall j\in \left\{0,1\right\} $$